Ground beef is usually not simply a chunk of meat run through a grinder. Instead... a single portion of hamburger meat is often an amalgam of various grades of meat from different parts of cows and even from different slaughterhouses. These cuts of meat are particularly vulnerable to E. coli contamination, food experts and officials say. Despite this, there is no [US] federal requirement for grinders to test their ingredients for the pathogen... “Ground beef is not a completely safe product,” said Dr. Jeffrey Bender, a food safety expert at the University of Minnesota who helped develop systems for tracing E. coli contamination.
Now I'm wondering how--and from what--our local burgers are made.